JPS6317504A - Permanent magnet and its manufacture - Google Patents
Permanent magnet and its manufactureInfo
- Publication number
- JPS6317504A JPS6317504A JP61162622A JP16262286A JPS6317504A JP S6317504 A JPS6317504 A JP S6317504A JP 61162622 A JP61162622 A JP 61162622A JP 16262286 A JP16262286 A JP 16262286A JP S6317504 A JPS6317504 A JP S6317504A
- Authority
- JP
- Japan
- Prior art keywords
- permanent magnet
- manufacturing
- cast permanent
- magnet according
- cast
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 239000013078 crystal Substances 0.000 claims abstract description 19
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 16
- 239000000956 alloy Substances 0.000 claims abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 238000005266 casting Methods 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 230000032683 aging Effects 0.000 claims abstract description 7
- 229910052742 iron Inorganic materials 0.000 claims abstract description 7
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 6
- 229910052752 metalloid Inorganic materials 0.000 claims abstract description 5
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 5
- 229910052723 transition metal Inorganic materials 0.000 claims abstract description 5
- 150000002738 metalloids Chemical class 0.000 claims abstract description 4
- 150000003624 transition metals Chemical class 0.000 claims abstract description 4
- 238000007711 solidification Methods 0.000 claims abstract description 3
- 230000008023 solidification Effects 0.000 claims abstract description 3
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- -1 composed of Fe or Co Chemical class 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims 1
- 230000006641 stabilisation Effects 0.000 abstract description 2
- 238000011105 stabilization Methods 0.000 abstract description 2
- 230000008018 melting Effects 0.000 abstract 1
- 238000002844 melting Methods 0.000 abstract 1
- 230000005347 demagnetization Effects 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 229910000765 intermetallic Inorganic materials 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910017827 Cu—Fe Inorganic materials 0.000 description 1
- 229910017061 Fe Co Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910001751 gemstone Inorganic materials 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000000879 optical micrograph Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は希土類とＦｅもしくはＦｅ、 ＣＯを主体とす
る遷移金属類とＢを主体とするメタロイドで構成された
鋳造永久磁石およびその製造方法に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cast permanent magnet composed of a rare earth element, a transition metal mainly composed of Fe or Fe, and CO, and a metalloid mainly composed of B, and a method for producing the same. It is something.
［従来の技術］
希土類遷移金属合金において希土類金属と遷移金属の比
が２：１７である金属間化合物が理論的に極めて高い磁
気特性［（ＢＨ）＋＋ａｘ 〜５０ＨＧＯｅｌを有する
ことが発見されて以来、同系化合物を主体とする永久磁
石実用合金を得る試みが種々実験されてきた。−例とし
て５ＩＩｌ−Ｃｏ−Ｃｕ−Ｆｅ系金属間化合物で（Ｂｔ
ｌ）ｍａｘ 〜３０ＨＧＯｅが達成され、さらにＭｄ
−Ｆｅ系金属間化合物で（ＢＨ）ｗ＋ａｘ 〜４０ＨＧ
Ｏｅの高磁気特性が得られている。この組成合金は粉砕
、磁場中配向圧縮成形あるいは非磁場中圧縮成形、焼結
、溶体化９時効する焼結型永久磁石による製造方法が一
般的である。[Prior Art] Since it was discovered that an intermetallic compound with a rare earth metal to transition metal ratio of 2:17 in a rare earth transition metal alloy has theoretically extremely high magnetic properties [(BH)++ax ~ 50 HGOel. Various experiments have been conducted in an attempt to obtain a practical alloy for permanent magnets mainly consisting of similar compounds. - As an example, in 5IIIl-Co-Cu-Fe based intermetallic compound (Bt
l) max ~30HGOe was achieved and further Md
-Fe-based intermetallic compound (BH)w+ax ~40HG
High magnetic properties of Oe have been obtained. This compositional alloy is generally manufactured using a sintered permanent magnet, which is pulverized, oriented compression molded in a magnetic field or compression molded in a non-magnetic field, sintered, and solution aged.
［発明が解決しようとする問題点］
しかしながらＮｄ−Ｆｅ−３系焼結型永久磁石は高磁気
特性が１９られるにもかかわらず、合金自体に粘りおよ
び機械的に強度が高（、Ｓｍ−Ｃｏ系焼結型永久磁石に
比較して、礪械的粉砕および機械的加工が困難であり、
さらに酸化により磁気特性の劣化を生じ、また樹脂結合
型永久磁石としてロール急冷したリボンを粉砕して樹脂
成形する製造方法があるが、結晶の成長方向性が不規則
なため、等方性の永久磁石にしかならないので、高磁気
特性が得られないという欠点があった。[Problems to be solved by the invention] However, although Nd-Fe-3 based sintered permanent magnets have high magnetic properties, the alloy itself has high stickiness and mechanical strength (Sm-Co, Compared to sintered permanent magnets, mechanical crushing and mechanical processing are difficult;
Furthermore, oxidation causes deterioration of magnetic properties, and there is a production method for resin-bonded permanent magnets in which a roll-quenched ribbon is pulverized and resin-molded, but because the direction of crystal growth is irregular, it is an isotropic permanent magnet. Since it can only function as a magnet, it has the disadvantage of not being able to obtain high magnetic properties.
本発明はこの点を鑑みて、希土類鉄系永久磁石の製造方
法を改良し、新規な組織の永久磁石を得ることにより、
磁気的異方性を得、高磁気特性を達成することを目的と
する。In view of this point, the present invention improves the manufacturing method of rare earth iron permanent magnets and obtains permanent magnets with a new structure.
The purpose is to obtain magnetic anisotropy and achieve high magnetic properties.
［問題点を解決するための手段］
本発明はＲ（Ｔ ＾ＩＭ）の一般式に１−ｘ−ｙ
Ｘ Ｖ
おいて、ＲはＹを含む希土類金属の一種もしくは二種以
上の組合せ、ＴはＦｅもしくはＦｅ、 Ｃｏを主体とす
る遷移金属、ＭはＢを中心とするメタロイドであり、式
中のｘ、ｙ、ｚがそれぞれ、０、００５≦Ｘ≦０．１
００１≦ｙ≦０．１
４≦７≦９
の範囲で規定される組成合金からなることを特徴とした
鋳造永久磁石であり、鋳造時のインゴットの金属組織が
主として柱状晶からなり、また柱状晶の成長方向に対し
て直角方向を磁極とする鋳造永久磁石である。またこの
鋳造永久磁石を製造する方法としては、組成合金を溶融
後、特定の方向に擬固させ、磁気的異方性を付与せしめ
ることであり、一方向性凝固により柱状晶を形成させる
。そして鋳造後、８００〜１ 、２００℃の温度領域に
て加熱処理を施すことにより結晶組織を安定化させ、鋳
造状態の保磁性を促進させる工程から永久磁石特性を付
与せしめる。さらに必要な場合、すなわち保磁性の安定
化を考慮したとき、加熱処理後、３００〜８００℃の時
効処理を施すことにより高性能化を実現できる。[Means for solving the problems] The present invention provides the general formula of R(T^IM) with 1-x-y
In the formula, , y, and z are respectively defined in the ranges of 0,005≦X≦0.1, 001≦y≦0.1, 4≦7≦9, and are cast permanent magnets. The metal structure of the ingot is mainly composed of columnar crystals, and it is a cast permanent magnet whose magnetic poles are perpendicular to the growth direction of the columnar crystals. The method for manufacturing this cast permanent magnet is to melt the compositional alloy and then pseudo-solidify it in a specific direction to impart magnetic anisotropy, and form columnar crystals by unidirectional solidification. After casting, a heat treatment is performed in a temperature range of 800 to 1,200°C to stabilize the crystal structure and promote coercivity in the cast state, thereby imparting permanent magnetic properties. Furthermore, when necessary, that is, when stabilization of coercivity is taken into consideration, high performance can be achieved by performing an aging treatment at 300 to 800° C. after the heat treatment.
また時効処理を少なくとも１００Ｏｅの磁界中で施すこ
とが磁気異方性の改善上好ましい。組成範囲において、
ＡＩ（アルミニウム）のＸの値がｏ、ｏｏｓ未満である
と鋳造組織が形成されず、０．１を越えるとＢｒ（残留
磁化）が低下し、メタロイドのｙの値が０．０１未満で
あると ｉＨｃ （保磁力）が得られず、０．１を越え
るとＢｒが低下し、Ｚ値が４未満ではＢｒが低下し、９
を越えると１１１ｃおよび鋳造時の柱状晶が得られない
ので、それぞれこの範囲に限定される。また製造方法に
おいて、鋳造後の加熱処理温度については、８００℃未
満では結晶組織の安定化が得られず、１．２００℃を越
えると柱状晶組織が崩壊し、加熱処理後の時効処理温度
については、３００℃未満では保磁力が向上せず、８０
０℃を越えると逆に保磁力が低下し、時効処理において
磁界強度が１００Ｏｅ未満では十分な異方性を有する結
晶成長が得られず、それぞれこの範囲に限定される。Further, it is preferable to perform the aging treatment in a magnetic field of at least 100 Oe in order to improve magnetic anisotropy. In the composition range,
If the value of X of AI (aluminum) is less than o or oos, a cast structure will not be formed, if it exceeds 0.1, Br (residual magnetization) will decrease, and if the value of y of metalloid is less than 0.01. and iHc (coercive force) cannot be obtained, and if it exceeds 0.1, Br decreases, and if the Z value is less than 4, Br decreases, and 9
If it exceeds 111c and columnar crystals during casting cannot be obtained, each is limited to this range. In addition, in the manufacturing method, when the heat treatment temperature after casting is less than 800℃, the crystal structure cannot be stabilized, and when it exceeds 1.200℃, the columnar crystal structure collapses. The coercive force does not improve below 300℃, and the
If the temperature exceeds 0° C., the coercive force decreases, and if the magnetic field strength is less than 100 Oe in the aging treatment, crystal growth with sufficient anisotropy cannot be obtained, and the magnetic field is limited to this range.
［実施例１］
”０．９ＤｙＯｊ （Ｆ２Ｏ，７３Ｃ００，２０”０．
０３５ Ｂｏ、０１５ ）５．４組成合金をアーク溶解
し、底面をＣｕ（銅）、側面を＾１□０３ （アルミナ
）で形成された鋳型内で鋳造した。この金属組織を第１
図に示し、明らかに温度勾配をなす方向に合金が凝固し
、柱状晶が成長していることがわかる。次にこのインゴ
ット、さらに１，０００℃、２時間、Ａｒ（アルゴン）
ガス雰囲気にて加熱処理したインゴット。[Example 1] "0.9DyOj (F2O, 73C00, 20"0.
035 Bo, 015) 5.4 composition alloy was arc melted and cast in a mold with a bottom surface made of Cu (copper) and a side surface made of ^1□03 (alumina). This metal structure is the first
As shown in the figure, it can be seen that the alloy solidifies in a direction that clearly forms a temperature gradient, and columnar crystals grow. Next, this ingot was further heated at 1,000°C for 2 hours using Ar (argon).
Ingot heat-treated in a gas atmosphere.
そしてざらに６００℃で時効処理したインゴットそれぞ
れを、ＶＳＭ （試料振動型磁力計）にて測定した減磁
曲線を第２図に示す。FIG. 2 shows demagnetization curves measured using a VSM (vibrating sample magnetometer) for each ingot that was roughly aged at 600°C.
［実施例２コ
ＮｄＯ，９５Ｄｙ０．０５”ｅＯ，８５Ｃ００，０５”
０．０５ 日０．０５ ’５．４の組成合金を実施例１
と同様に作製し、インゴットから８ｍ＋角のブロック体
を切り出し、柱状晶の軸方向（Ｌ）およびそれと直角方
向（Ｓ）の磁気特性を、それぞれＶＳＭにて測定した減
磁曲線を第３図に示す。鋳造後の磁気異方性は、明らか
に柱状晶の成長方向と直角な方向に存在し、磁気異方性
を有するインゴットが得られた。[Example 2 NdO, 95Dy0.05"eO, 85C00,05"
Example 1 An alloy with a composition of 0.05'5.4
Figure 3 shows the demagnetization curves obtained by cutting out an 8m+square block from the ingot and measuring the magnetic properties in the axial direction (L) and perpendicular direction (S) of the columnar crystals using a VSM. show. The magnetic anisotropy after casting clearly existed in a direction perpendicular to the growth direction of the columnar crystals, and an ingot with magnetic anisotropy was obtained.
［実施例３１
Ｎｄ Ｄｙ （Ｆｅ Ｃｏ ＡＩ
Ｂ ）０．９５ ０，０５ ０，８５ ０，０５
０．０５ ０．０５ ５．４の組成合金を実施例１と同
様に作製してインゴットを得、１ 、０００℃、２時間
加熱処理した後、水冷し、次に６００℃の時効処理を無
磁界中および５にＯｅの磁界中で施した。得られたイン
ゴットから８ｍ角のブロック体を切り出し、柱状晶の方
向と直角方向の磁気特性を、それぞれＶＳＭにて測ｆし
た減磁曲線を第４図に示す。角型性および保磁力とも増
加していることがわかる。[Example 31 Nd Dy (Fe Co AI
B) 0.95 0.05 0.85 0.05
An alloy with a composition of 0.05 0.05 5.4 was prepared in the same manner as in Example 1 to obtain an ingot, heat treated at 1,000°C for 2 hours, water cooled, and then aged at 600°C. in a magnetic field and in a magnetic field of 5 Oe. An 8 m square block was cut from the obtained ingot, and the magnetic properties in the direction perpendicular to the direction of the columnar crystals were measured using a VSM, and the demagnetization curves are shown in FIG. 4. It can be seen that both squareness and coercive force increase.
第１図は本発明の鋳造合金における金属組織の光学顕微
鏡写真である（倍率Ｘ ４００）。
第２図は本発明の各工程における磁気特性をＶＳＭ（試
料振動型磁力計）にて測定した減磁曲線で示す。
Ａ：鋳造後の状態
Ｂ：Ｉ造＋ １ 、０００℃、２時間の加熱処理後の状
態Ｃ：！ｇ造＋ １，０００℃、２時間の加熱処理＋６
００℃時効処理後の状態
第３図は本発明の鋳造永久磁石の磁気特性を、ＶＳＭに
て測定した減磁曲線で示す。
Ｌ：柱状晶の軸方向 Ｓ二軸と直角方向第４図は本発
明の鋳造永久磁石の製造方法による磁気特性を、ＶＳＭ
にて測定した減磁曲線で示す。
Ｅ：無磁界 Ｆ：５にＯｅの磁界中特許出願
人 並木精密宝石株式会社
図 面
第 ＩＥ
第２図
第 ３ｅ！ｍFIG. 1 is an optical micrograph of the metal structure of the cast alloy of the present invention (magnification: X 400). FIG. 2 shows magnetic properties in each step of the present invention using demagnetization curves measured using a vibrating sample magnetometer (VSM). A: Condition after casting B: Condition after heat treatment at 1,000°C for 2 hours C:! G construction + 1,000℃, 2 hours heat treatment +6
Condition after aging treatment at 00° C. FIG. 3 shows the magnetic properties of the cast permanent magnet of the present invention using a demagnetization curve measured by VSM. L: axial direction of columnar crystal S direction perpendicular to the two axes FIG.
This is shown as a demagnetization curve measured at E: No magnetic field F: 5 to Oe in magnetic field Patent applicant Namiki Precision Jewel Co., Ltd. Drawing No. IE Fig. 2 No. 3e! m
Claims (1)
一般式において、ＲはＹを含む希土類金属の一種もしく
は二種以上の組合せ、ＴはＦｅもしくはＦｅ、Ｃｏを主
体とする遷移金属、ＭはＢを中心とするメタロイドであ
り、式中のｘ、ｙ、ｚがそれぞれ、０．００５≦ｘ≦０
．１ ０．０１≦ｙ≦０．１ ４≦ｚ≦９ の範囲で規定される組成合金からなることを特徴とした
鋳造永久磁石。 （２）鋳造時のインゴットの金属組織が主として柱状晶
からなる特許請求の範囲第（１）項記載の鋳造永久磁石
。 （３）柱状晶の成長方向に対して直角方向を磁極とする
特許請求の範囲第（２）項記載の鋳造永久磁石。 （４）Ｒ（Ｔ＿１＿−＿ｘ＿−＿ｙＡｌ＿ｘＭ＿ｙ）の
一般式において、ＲはＹを含む希土類金属の一種もしく
は二種以上の組合せ、ＴはＦｅもしくはＦｅ、Ｃｏを主
体とする遷移金属、ＭはＢを中心とするメタロイドであ
り、式中のｘ、ｙ、ｚがそれぞれ、０．００５≦ｘ≦０
．１ ０．０１≦ｙ≦０．１ ４≦ｚ≦９ の範囲で規定される組成合金を溶融後、特定の方向に凝
固させ、磁気的異方性を付与せしめることを特徴とした
鋳造永久磁石の製造方法。 （５）一方向性凝固により柱状晶を形成させる特許請求
の範囲第（４）項記載の鋳造永久磁石の製造方法。 （６）鋳造後、８００〜１、２００℃の温度領域にて加
熱処理を施す特許請求の範囲第（４）項記載の鋳造永久
磁石の製造方法。 （７）加熱処理後、３００〜８００℃の時効処理を施す
特許請求の範囲第（４）項記載の鋳造永久磁石の製造方
法。 （８）時効処理を少なくとも１００Ｏｅの磁界中で施す
特許請求の範囲第（７）項記載の鋳造永久磁石の製造方
法。[Claims] (1) In the general formula of R(T_1_-_x_-_yAl_xM_y), R is one or a combination of two or more rare earth metals including Y, and T is Fe or a transition mainly composed of Fe or Co. The metal M is a metalloid centered on B, and x, y, and z in the formula are each 0.005≦x≦0.
．． 1. A cast permanent magnet comprising an alloy whose composition is defined in the following ranges: 1 0.01≦y≦0.1 4≦z≦9. (2) The cast permanent magnet according to claim (1), wherein the metal structure of the ingot at the time of casting is mainly composed of columnar crystals. (3) The cast permanent magnet according to claim (2), wherein the magnetic pole is in a direction perpendicular to the growth direction of the columnar crystals. (4) In the general formula of R(T_1_-_x_-_yAl_xM_y), R is one or a combination of two or more rare earth metals including Y, T is Fe or a transition metal mainly composed of Fe or Co, and M is B. It is a metalloid at the center, and x, y, and z in the formula are each 0.005≦x≦0.
．． 1 A cast permanent magnet characterized in that an alloy whose composition is defined in the range of 0.01≦y≦0.1 4≦z≦9 is melted and then solidified in a specific direction to impart magnetic anisotropy. manufacturing method. (5) A method for manufacturing a cast permanent magnet according to claim (4), in which columnar crystals are formed by unidirectional solidification. (6) The method for manufacturing a cast permanent magnet according to claim (4), wherein after casting, a heat treatment is performed in a temperature range of 800 to 1,200°C. (7) The method for manufacturing a cast permanent magnet according to claim (4), wherein after the heat treatment, an aging treatment is performed at 300 to 800°C. (8) A method for manufacturing a cast permanent magnet according to claim (7), wherein the aging treatment is performed in a magnetic field of at least 100 Oe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61162622A JPS6317504A (en) | 1986-07-10 | 1986-07-10 | Permanent magnet and its manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61162622A JPS6317504A (en) | 1986-07-10 | 1986-07-10 | Permanent magnet and its manufacture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6317504A true JPS6317504A (en) | 1988-01-25 |
Family
ID=15758106
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61162622A Pending JPS6317504A (en) | 1986-07-10 | 1986-07-10 | Permanent magnet and its manufacture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6317504A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11291926B2 (en) | 2017-05-29 | 2022-04-05 | Hanayama International Trading Ltd | Polyhedral toy |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62203303A (en) * | 1986-03-03 | 1987-09-08 | Seiko Epson Corp | Cast rare earth element-iron system permanent magnet |
| JPS62203302A (en) * | 1986-03-03 | 1987-09-08 | Seiko Epson Corp | Cast rare earth element-iron system permanent magnet |
-
1986
- 1986-07-10 JP JP61162622A patent/JPS6317504A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62203303A (en) * | 1986-03-03 | 1987-09-08 | Seiko Epson Corp | Cast rare earth element-iron system permanent magnet |
| JPS62203302A (en) * | 1986-03-03 | 1987-09-08 | Seiko Epson Corp | Cast rare earth element-iron system permanent magnet |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11291926B2 (en) | 2017-05-29 | 2022-04-05 | Hanayama International Trading Ltd | Polyhedral toy |
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